<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>展示ES6新特性</title>
		
		<script>
			var a = 10;
			{
				var a = 20;
				console.log(a);			
			}
			console.log(a);
			let b = 100 ;
			{
				let b = 200;
				console.log(b);
			}
			console.log(b);
			
			
		</script>
		
	</head>
	<body>
	</body>
</html>
